I think it should be added that you are in for a rough time. Portage is too old to update itself at this point, glibc won't do a direct update, and you may or may not need to deal with updating to baselayout 2. Udev also has started doing funny things to your network names. You should pay attention to that as well.

That said, you may be ok if you read your portage output and triple check everything before you reboot. Your kernel is also too old for newer udev versions. That could be an issue._________________First things first, but not necessarily in that order.